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Proceedings Paper

3D gain modeling of LMJ and NIF amplifiers
Author(s): Geoffroy LeTouze; Olivier Cabourdin; J. F. Mengue; Mireille Guenet; Eric Grebot; Stephane E. Seznec; Kenneth S. Jancaitis; Christopher D. Marshall; Luis E. Zapata; A. E. Erlandson
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Paper Abstract

A 3D ray-trace model has been developed to predict the performance of flashlamp pumped laser amplifiers. The computer program, written in C++, includes a graphical display option using the Open Inventor library, as well as a parser and a loader allowing the user to easily model complex multi-segment amplifier systems. It runs both on a workstation cluster at LLNL, and on the T3E Cray at CEA. We will discuss how we have reduce the required computation time without changing precision by optimizing the parameters which set the discretization level of the calculation. As an example, the sample of calculation points is chosen to fit the pumping profile through the thickness of amplifier slabs. We will show the difference in pump rates with our latest model as opposed to those produced by our earlier 2.5D code AmpModel. We will also present the results of calculations which model surfaces and other 3D effects such as top and bottom refelcotr positions and reflectivity which could not be included in the 2.5D model. This new computer model also includes a full 3D calculation of the amplified spontaneous emission rate in the laser slab, as opposed to the 2.5D model which tracked only the variation in the gain across the transverse dimensions of the slab. We will present the impact of this evolution of the model on the predicted stimulated decay rate and the resulting gain distribution. Comparison with most recent AmpLab experimental result will be presented, in the different typical NIF and LMJ configurations.

Paper Details

Date Published: 23 July 1999
PDF: 8 pages
Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); doi: 10.1117/12.354177
Show Author Affiliations
Geoffroy LeTouze, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Olivier Cabourdin, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
J. F. Mengue, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Mireille Guenet, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Eric Grebot, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Stephane E. Seznec, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Kenneth S. Jancaitis, Lawrence Livermore National Lab. (United States)
Christopher D. Marshall, Lawrence Livermore National Lab. (United States)
Luis E. Zapata, Lawrence Livermore National Lab. (United States)
A. E. Erlandson, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3492:
Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
W. Howard Lowdermilk, Editor(s)

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